Bottom construction for furnaces.



H. H. BLAKE.

BOTTOM CONSTRUCTION FOB FURNACES.

APPLICATION FILED JUNE 30, 1911.

L14A0QB Patented July 21, 1914,

FIG. 2.

m INYENTOR.

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s'rnrrus HENRT' H. BLAKE, OF PITTSBURGH, PENNSYLVANIA, ASSIGNOR T BLAKE CBUSHER AND PULVERIZER COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION or PENNSYLVANIA.

BOTTOM CONSTRUCTION FOR FURNACES ion roe.

Specification of Letters Patent.

Patented July at, an.

hpplication filed June 30, 1911. Serial No. 636,294.

To all whom it may concern: v

Be it known that I, HENRY H. BLAKn, a citizen of the United States, and residing in the city of Pittsburgh, in the county. of Allegheny and State of Pennsylvania, have invented or discovered new and useful Improvements in Bottom Construction for Furnaces, of which the following is a specification.

My invention consists of a new and improved construction for the bottom or floor of a furnace; or other combustion chamber. It is especially applicable to combustion chambers wherein pulverized fuel is introduced under pressure in such a manner that the flame impacts against and reverberates from the floor of the combustion chamber. A fire-brick floor exposed to such treatment quickly 'disintegrates and the products of combustion precipitated thereon adhere thereto and cannot be removed without injury .to the floor structure. i

Where sufficient space is available beneath the combustion chamber a deep bed of ash may be maintained andkept at proper level to receive and reverberate the flame but fre- .quently there is not space for such a bed of I ash and some other floor structure requiring less room must be substituted. This is especially true in the case of. light draft river teamers, locomotives,'andin boiler rooms where there is no. considerable excavation under the boilers. I

By the use of my invention all the advantages of the deep ash-bed are obtained by the use of a shallow layer of ashes, at much less cost of installation, and under circumstances which prohibit-the use of the'deep I lied. For this purpose I install in ,the bot- 40 tom of-th'e combustion chamber, .as in the.

,ash-pit of the ordinary furnace, and above the floor thereof, a series or system of water pipes or other cooling agents, preferably connected to a common supply, and which may, if desired, be used as a preliminary heater for the boiler .water. These pipes-are spa'ced apart preferably for a distance some-" what-greater than their diameter,--and'in-' clined' downwardly toward the front wall of thecombustion chamber where aldoor isprovided for the removal of the-surplus accumulations of ash.

The spacebetween the pipes and the floor of the chamber becomes filled with ashes which form a permanent bed sufficiently chilled by the pipes to prevent injury to the floor. Above the pipes a layer of ashes is formed by accumulation which receives the impact of the flame and reverberates [the same upwardly. The top layer remains at ahigh temperature so that the particles of combustible material which may be deposited thereon from the flame are consumed without loss of heat value. The top layer is maintained at the proper level by removals from time to time through the ash door and a tool may be introduced occasionally to smooth the top of said layer. The products of combiistion will not adhere to the pipes but may be readily removed when desired.

In the accompanying drawings, Figure l is a vertical section of a boiler furnace fitted with my invention, and Fig. 2 is a detail plan of the pipe system recommended for use in connection with my invention.

The following is a deta' ed description of the drawings.

A is a boiler; B is the furnace or combustion chamber; C -is the bridge wall; D the arch, and E the front Wall. F represents the fuel distributor introducing. pulverized fuel from above. The fuel is ignited by the heat of the furnaceand. forms a veryv hot' fiame G which impacts against the bottom of the combustion chain ber and is reverberated thereby.

1 'is-the flooror bottom of he combustion I chamb'er'formed of any suitable material, such as fire-brick. Spaced above the floor'l isjacooling device,-show1 1 as a system of water pipes 2-2 which are preferably inclin'ed downwardly toward the front wall E and connected to a common header 3 which -is 1 of greater diameter than pipes 22.

Water is suppliedto header 3 and through it temperature to pipes 22 to keep downthe 011' said pipes.

I find it convenient to use the pipes 22 for the preliminary heating of the boiler Water. 'In' such case I may admit the Water to header 3 through a pipe 4, preferably of;

greater diameter than .pipes 2-2, and connected to the water supply pipe'5. 1 The ends of the'pipes %.2 are-connected by unions 6-45. The other end of header 3 is connected by pipe to the boiler for the purpose of feeding water, previously heatedin the water cooled pipes to the boiler.

The ashes dropping down through pipes 2 2 form a permanent bed 8 on the floor 1 extending up to the pipes 22. This bed 8 protects the floor 1 against excessive heat, being kept at moderate temperature by the pipes 2-2, Above the pipes 2"2 a second bed of ash, 9, is allowed to accumulate which receives the impact of and reverberates the flame Gr. v

A dOOr or opening 10 is formed in the front Wall at the foot ofpipes 2 2 for the occasional removal of the surplus ashes as they accumulate, and the top of bed 9 may be kept level by means of a tool inserted through a door 11 in the WallEabove the door 10. The inclination of the pipes 22 facilitates the removal of surplus ashes through the door 10.

It is evident that my lnvention provides a' floor construction for the purpose described that will not disintegrate, is self-renewing, requires no more Lspacethan the ordinary ash-pit, and completely protects the floor of the combustion-chamber.

stantially horizontallyarranged, imperfo- I What I desire to claim is 1. Cooling means especially adapted for shallow combustion-chambers of furnaces, comprising, in combination with the combustion-chamber, a series of comiected, subrate pipes disposed near the bottom of said combustion-chamber, means for circulating .water through said pipes, and a bed of material disposed betweensaid pipes and the bottom of said.combustion-chamber, and

serving as a non-conductor of heat.

2. Cooling means especially adapted for shallow combustion-chambers of furnaces;

comprising, in combination with the combustion-chamber, a series of connected pipes disposed near the bottom of said combustion-ehamberand inclined from the rearjto the front of said combustion-chamber, means for circulating .Water therethrough, and a bed of material disposed between said pipes and the bottom of said combustion-chamber, and servingas a non-conductor of heat;

3. In a furnace, a boiler, connected pipes communication therebetween, means for cirbed of material disposed between saidflpipes' and the bottom of said oombustion-c-ham- "disposed near the bottom of the combustionchamber of the furnace, a connection be- F tween said pipes and said boiler, affording 5-5. culatingvwater threugh'said pipes and a 

